32
Electric heater
126
Minimum flow rate for electric heater operation
Minimum flow rates depending on the unit model:
Model (P1)
Electric heater min. flow rate (P126)
Classic PHE 1000 Alu
500 m
3
/h
Classic PHE 1000 PP
500 m
3
/h
Classic PHE 2000 Alu
1000 m
3
/h
Classic PHE 2000 PP
1000 m
3
/h
Classic PHE 3000 Alu
1500 m
3
/h
Classic PHE 4000 Alu
2000 m
3
/h
Classic PHE 6000 Alu
3000 m
3
/h
Classic RHE 1000 Alu
500 m
3
/h
Classic RHE 1000 PP
500 m
3
/h
Classic RHE 2000 Alu
1000 m
3
/h
Classic RHE 2000 PP
1000 m
3
/h
Classic RHE 3000 Alu
1500 m
3
/h
Model (P1)
Electric heater min. flow rate (P126)
Classic RHE 4000 Alu
2000 m
3
/h
Classic RHE 5000 Alu
2500 m
3
/h
Classic RHE 6000 Alu
3000 m
3
/h
Classic RHE 7500 Alu
3750 m
3
/h
Classic RHE 10000 Alu
5000 m
3
/h
Classic RHE 15000 Alu
7500 m
3
/h
Vertical PHE 700 Alu
350 m
3
/h
Vertical PHE 700 PP
350 m
3
/h
Vertical PHE 1500 Alu
750 m
3
/h
Vertical PHE 1500 PP
750 m
3
/h
Vertical PHE 2000 Alu
1000 m
3
/h
Vertical PHE 2000 PP
1000 m
3
/h
Fan delay
If the electric heater is running and a unit shutdown request appears, a settable post ventilation (P164) is used for cooling the
electrical heaters.
164
Fan delay time
3.10 - Free Cooling
Free cooling is used to cool the building when the outdoor temperature is lower than that inside the building. This operating mode
is used when the following conditions are met:
-
Function activated in parameters P150 (only if control takes place on the return air or room temperature)
-
Cooling requirement: the PID output must be greater than 0%
-
The difference between the controlled temperature (measured return or room) and the fresh air must be sufficient: fresh air
temperature < controlled temperature – P206 (factory value 3°C)
-
The fresh air temperature is above the "free cooling temperature low limit" (P207)
In free cooling mode, the supply air temperature is not monitored, and the heat recovery unit and coil are shut down. It is important
to configure a fresh air temperature low limit which is sufficiently high to ensure no discomfort is caused.
150
Free cooling control
206
Free cooling and night cooling operating differential compared to the controlled temperature
207
Temperature low limit for free cooling and night cooling
3.11 - Night cooling
The regulated temperature must be the return or room air value. The fans control must be based on flow rate. Night cooling is used
to cool the building using the colder night air.
In this case, when night cooling is active, the ventilation flow rate setpoint is the "night cooling" flow rate (P212 and P213).
Several conditions must be met to activate night cooling:
-
The function must be activated by parameter P151
-
The controller is located in a "night cooling" time slot or this is overridden via the CMS
-
Cooling requirement: the controlled temperature must be greater than the night cooling temperature setpoint P210
-
There must be sufficient difference between the controlled temperature and the fresh air: fresh air temperature < controlled
temperature – P206 (factory value 3°C)
-
The fresh air temperature is above the "night cooling temperature low limit" (P207)
Periodic restarts: if one of the conditions for activation of night cooling is not verified (fresh air temperature, night cooling difference,
or cooling requirement), the unit shuts down.
The fans will be restarted at the night cooling flow rate for 5 minutes each hour, and night cooling will be reactivated if all the
conditions are verified. Otherwise, the AHU will stop again.
151
Night cooling control
206
Free cooling and night cooling operating differential compared to the controlled temperature
207
Temperature low limit for free cooling and night cooling
210
Control setpoint in night cooling mode
212
Air intake fan flow rate setpoint in night cooling mode
213
Air extraction fan flow rate setpoint in night cooling mode
3 - FEATURES
EN-23
FLOWAY
